ROTATIONAL SPECTRUM OF 1,1-DIFLUOROETHANE - INTERNAL-ROTATION ANALYSIS AND STRUCTURE

The rotational spectrum of CH3CHF2 in its ground state was measured up to 653 GHz. Accurate rotational and centrifugal distortion constants were determined. The internal rotation splittings were analyzed using the internal axis method. An ab initio structure has been calculated and a near-equilibrium structure has been estimated using offsets derived empirically. This structure was compared to an experimental r(0) structure. The four lowest excited states (including the methyl torsion) have also been assigned. (C) 1995 Academic Press, Inc.